Centrifugal settling machine



F. c. RAWOLLE CENTRIFUGAL STTLING MACHINE Filed Aug. v. 1924 Hlll* Mtnesses:

1 Patented 0d. 4, 1927.

FREDERICK c. nAwoLLn,

' "1,564,492 WCE* orV SALEM, ooivivricrmiim." L Y l, .l 'CENTR-Innen. 'snT'r'LNe MACHINE.

Application lined Augst; 7211924. semi No. 730380;

My invention relates par-ticularly to Vcenvtrifugal machines adapted for separating solids 4from liquids; andrmy primary object is to provide lav centrifugal settling machine which will operate eifectively and Y economically in separating solid matter in a iinelyl divided state" from la solution parvticularly whensome of the'fine, solid matter happens to'be of the same specihc gravity as the solution in 'which' solidmatter "is practically suspended.

lt may be preliminarily stated that according to a process for treating and 'dissolving crude shellac invented by 'me there is more or lless of a percentage of impurities that remain suspended in the solution l and these impurities must be separated from this solution before properlyproceedmo'. I lhe accompanying drawings-illustrate the v preferred embodiment of my invention.

In the drawings, Fig. '1, 'represents a plan of the centrifugal settlingmachine constructed in accordance with the working principle v of my invention. yIt isshown cut onthe two levels, a, b, and ad., shown in Fig."

' Fig. 2, shows a vertical section cut o n .the lines, e and f, (Fig. 1) through the vertical axial line yof the machine. F ig. 3,*shows an enlarged horizontal sectionalk view of one of `the liquor conduits in one of the' radial partitions'between two compartments located inA the rotating member or basket of the centrifugal settling machine. Fig. 4, shows an enlarged broken section of'one ofthe two conduits in which water ismixed in'with the liquor asit passes through fromr one coni-` partment to thenext.l Adding water to a Vsolution that is of high specific gravity, will lower the jspecific.gravity` of. the mixture to such a degree that the particles that tend lto remain suspended intheheavier liquor, will readily'separate from this mixture' of liquor and water.v "Inthe construction illusltrated, there is the body 1, having somewhat the shape of a small tank, and which is supported on thelegs, 19, 19, which are secured l to the base, 31. `The bottom, 37, isshaped to form a-fsludge receptacle, andl is in effect' ashallow pan, havinga 'circular rim, 39, 39. This'rim, 39, besides encircling this sludge receptacle, forms aV circular'trough, 33, 33, inside the yperiphery `.of the bottom, 37. A pipe, 34, discharges the liquid collecting` in this trough, 33, while the pipe, 38, discharges sludge from the pan shaped space. Projectdirectly from'these pipes into the compart-j' ing upward'from the 4centerof thebottom, 37, is a bearing, 310,'which, with the bearing ments, 51 and 6L These two pipes are se-l cured to andfrotate with the basket.

The basket, 2, is divided into sets of coml partments. l have shown Vin this draw-ing Yfour in each set and only twosets; although the number of setsv or' compartments maybe cfa lesser number Vor may bemore. lt 'is 'advisablerin order'to obtain agood ruiming rotary balance that each Yset has the same number of compartments and'that each'set be so arrangedithat'its compartmentshaving like weightsl should balance centrifugally. In order to obtain a good balance, the

vnumber one compartment of one set is placed diametric'ally across the basket from the number one of the other sett; and' number twoy ldirectly across from the other'number two and so on. v

l. For convenience in referring to individual compartments in -this description, 'I have numbered each of th'efour compartments of.

are 51,' 5 2, 53, 54. ln the other set 61, 62,

63, 64:. In describing theoperation, I have. referred 'to two like features insteadv of one,-

as thetwo must necessarily jworksimilarly eachv setsep-arately. In one set the numbers' I and'both at the Sametime.' Radial. partitions, 5, separate these compartments, and these partitions mayor may not bey spaced inside the basket at uniform distances apart. Radial passageways, 6, are/located in all these radial partitionsk except the first one of eachr ofthe two sets. These passagewvays, 6, have two openings each. One opening, V0,0, Figs. 3 and 4L, receivesaflowof liquor, taken from a centrifugal view point, near thetop of4 the rst compartments, 51 and k61, of the;

twoy sets. This liquor then flows further from the axial line of the basket through the passageways, '6 and 01 and out into the next `compartments of the series, 52 and 62,f

not@nos-loooo iogsf'oooooot todo@ centri f u'galv action L liquid tends. to seek? a; i ,Fcirculalilevel??andhisjztendency causes the ,owfz through f' the' passageways.' 1 Otherw1'se,

fone compartment *would fill u centrifugallyf 'higher'thananother. After' owing through.' theaoponings 0.- 0,.the f1owpossesinto tho -f next twofoompartments' of the series: The

'i '.inf.jtliese following'compartments and thegiwfenterjs the passageways 6,6,.leading paaeggeways 4is approximatelythe same until '1,113f'compalit-natalits.154-andv 64,- then an additional `flow of water. @isi added .tOi-Che i 'i f Honor,kin'itheselastftwo compartments obvif has o .iightor 'opooino gravity thon Yin o jeithe'r'of the others. lnthis processtheiadded intel? doS not harm the Solution materially.

f -Gifnthatthe solution changes to a lighter gravity and theP- solid particlesjre necessarily. `separate ,from theV solution in aV and dqgwyi1't hroughlthepipe, 15,-andthen into j tho water YSection, V17. Y Centrifugal action. 40j

vaivenes.. the. remain .this Wafer Section ffrom-gletting out in lother 'directions than dupes. the Pipeszlf, 18.26The1n0zz1e, 36,

f. delivers' water with a jeta'ction into ythe @mandaten Vinthe basketas it. SlOlWS' up Y sludge orf V s 'olid'lna tterf that 'accumutho toomponrooncs Vof uio 'besloot .deer and Water? Owing o' gravity lo@-H ngmorelintensegthan centrifugal action, f tops lthfnl'ghth lhleS; 35, .into the Shaped par# eine' bewaar@ and then 1 out through inopipoes;

Afsf maryf of' the series of nflovernentsV Vitllat fconiplete ionev c cleloff the" operation 'is 'as:;-o1lows fLiquor Vows continually during I rotation .intothefbasketfatthe pro erfquanf tythroughi Vtho f pipo,- l15, l thon own into i through theA pipes, .l2 n'dwl, into. the .-';cornpart`ments, land .61. '.'Theiheavier solid `matter;depositsfonthe bottom or `inside surthe? liquorginsidegwfAs thefliquorv Hows frqz n ooooomportmootro tho' 1 next tho l f! tosvierimpurinos romain" on tho bottom s,

main .the same.

centrifugally, 'of eachcompartment. The two irstcompartments`of1each 'setusually contain .the most Vof the vhefowy impuritiesa the -t-wof'second compartments "contain the` next `heavier' iinl'iuritiesr and the two thirdV compartments contain very Vlittle if Vany of the heavy Inatterpflhe floating impurities mostlyremain on the circular surfaces of theliqu'orzof the two first compartments andi they .can not passfalong Withthe lflowA to the next compartment, as iioatingfparticles must remain on ythe circular surface. Dthat--kis nearer the center-'of the basket.; This maf` terialjfheing aboveth'e' level, centrifugally, can noty enter the"passages4 leading to the'- `neXt. 'llhisiioating sludge must be washed out throughi.theholes, 35, alongffwith the heavier y slud V'e and the remaining' liquori Theffew solid iInpuri-ties' that Ystay in thei i Aliquor yof the third .two compartments, 53

and 63, usually have about 'the same specific 1 gravity as the liquorsolution and. thereforI will not separate .from the 'solutionby centrifugalaction.

the nowli'ghter liquorjust as do the heavier solid impuritiesV in the two first compart-iy ments. The clarified vliquoroverflowsg out ofthebasket, 2, through the outl etpipe, 10,., and is caught in the trough,"83.` VDepending 0`o 'von thejcapacity ofthemachine and on the proportion of impurities inthe flowing liquor, the flow of liquor is stopped and slow'speed The liquor heldi'up by thecenv trii'ugal action, then throughv itsV own'weig'ht By adding water into the fourthtwo compartments through the pipes,- 18, ktliefspecific gravity of the liquidv lowers -while' that of'thesolid impurities 'must re- Obviously these solid particles vmust then settle and separate'from '93 the rotation of the basket ris reduced to a i i' sinks to thef'bottom ofthe basket and Hows down through the holes,735. Any of the.

sludge thatsticks in the'4 ycompartments is.,

loosened by the jet ofwater, 36.

1 What I Yclaimv is las follows:

. "1. The'y process' of separating;k lparticles f rroma solution, consisting of continuously f .feeding a solution, into'a iirstfbodyfof Aaseries, separating impurities yby centrifugal ac#v l tion, discharging from V the partially purified circular level of the irstbody into the secfond body, likewiseseparating impurities from the second body and discharging'into the third body, *likewisel discharging' Vinto a fourth body but Vadding waterto this discharge issuing, from the third body, separating, the impurities by centrifugal action and i discharging the puriiiedV liquor fromfthe 'cir-if cular surfaceof the fourth body and collectingthe'purified solution.'v

V125 2.y The process -of separating particles from a solutionconsisting ofcontinuously feeding :a solution containing vloose particles# uof" a higherr s ecilic gravity Ithan the' solu-k tion along 'wit other particles having'about heavier than the solution by a centrifugal action that forces the heavier further from the center of rotation, then lightening they rsufficient Water to decrease the specific gravity to less than that'of 'the solid particles remaining in suspension. Y

i 3. The process of separating solid particles from a solution consisting of continuously feeding asolution 'into a first body of a series, separatingtherefrom impurities of greater specific gravity than the solution by utilizing centrifugal action `to move and hold the sinlable particles in this first body to a position farthest away from the center of rotation but to move the floatable particles to the circular surface of the solution nearest the center of rotation, utilizing this floatability to preventfthe lighter particles from passing to the second Body, passing this purer solution to the second Vbody of the series undergoing further purifying, vlikewise passing to a third body, adding Waterv to the solution and passing to a fourth body separating in the fourth body the solid parti- Y cles that correspond in specific gravity tothe solution inthe third body and collecting theV purified solution.l Y

'4. The process of separating solid particles from a solution consisting ofcontinuously feeding` av solution into a first body of a series, separati-ng therefromimpurities of va'greater specific gravity than the solution .Y by utilizing centrifugal actionto move and hold the sinkable particles in the first body toa position farthest avvayy from the center of rotation but to move the floatable particles to the circular surface of the solution that is nearest tothe center of rotation,`uti lizing this float-*ability to prevent the lighter particles from passing to Vthe second body,

passing Athis p urer solution to the'second body of the yseries undergoing .further purifying, likewise passing solution to a` third body, adding Water to the solution and passing to a fourth body, separating in the fourth body the solid particles having the` same specific gravity as the solution in theA third body, collecting the purified solution, and flushing out by a jet action, all the floatable suspendable and the sinkable particles.

' FREDERICK C. RAVVOLLE.` 

